HVAC Maintenance Guide

Why Is Your AC Leaking Inside?

If your AC is leaking water inside your home, it usually means something is clogged, frozen, or not draining properly. Here’s what causes it and how to fix it.

General information only. Electrical, gas, and refrigerant work can be dangerous and in many states requires a licensed contractor. When in doubt, call a licensed pro.

Common Reasons Your AC Is Leaking Water Inside

Most indoor AC leaks are caused by airflow issues, drainage problems, or frozen components. Fixing these early can prevent expensive damage to your home.

Clogged condensate drain line
Frozen evaporator coil
Dirty air filter
Low refrigerant levels
Damaged or rusted drain pan

Indoor AC evaporator coil and refrigerant lines covered in ice

Frozen Coil

When your coil freezes and melts, excess water can overflow and leak inside.

Dirty Air Filter

Restricted airflow can cause freezing, which leads to water leaks later.

Low Refrigerant

Low refrigerant can freeze your system and cause water buildup when it melts.

What to Check First

✔ Turn off your AC to prevent damage

✔ Check if your air filter is dirty

✔ Inspect the drain line for clogs

✔ Look for ice on the unit

When to Call an HVAC Professional

If your AC keeps leaking, freezing, or not cooling properly, it’s time to call a professional. Ignoring it can lead to water damage, mold, and costly repairs.

FAQ: AC Leaking Inside

Is it normal for an AC to leak water inside?

No. Water should drain outside. Indoor leaks mean a problem.

Can a dirty filter cause leaks?

Yes. It can freeze your system and cause water overflow.

Should I turn off my AC if it’s leaking?

Yes. This helps prevent further water damage.